{"product_id":"abb-s5n-4p-400a-circuit-breaker","title":"ABB | S5N-4P-400A | Circuit Breaker | 400A | 4-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eABB S5N-4P-400A Circuit Breaker\u003c\/strong\u003e is a purpose-built protective device designed for demanding electrical installations where precise compatibility and reliable fault protection matter. With a 400A rating, 4-pole configuration, and a 600V operating envelope, this breaker is ready to safeguard large feeders and panelboards in industrial, commercial, and retrofit settings.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 400A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 4-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReference:\u003c\/strong\u003e S5N-4P-400A\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eWhat makes it unique\u003c\/strong\u003e is the deliberate alignment of its ratings with real-world panel and feeder needs. This isn’t a generic replacement — it’s a precise match for maintenance, retrofit, or replacement projects where the exact part number and performance characteristics drive safe, code-compliant protection in three-phase systems (with the potential neutral connection on the 4-pole configuration). The S5N-4P-400A ensures coordinated protection across the circuit, helping to prevent equipment damage and electrical downtime.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eIdeal use scenarios\u003c\/strong\u003e include:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eUpgrading an aging service panel to handle heavier loads in a 3-phase system.\u003c\/li\u003e \u003cli\u003eReplacing a failed breaker in a 600V installation while preserving existing wiring and enclosure fit.\u003c\/li\u003e \u003cli\u003eRetrofit projects where exact amperage, pole count, and voltage ratings are required to maintain system reliability.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eCompatibility and procurement guidance\u003c\/strong\u003e — before you order, verify the fit and ratings for your specific installation. The part number \u003cem\u003eS5N-4P-400A\u003c\/em\u003e is the most reliable reference for compatibility, ensuring correct physical fit and electrical performance in your panelboard or switchgear. If your setup calls for a 400A, 4-pole device in a 600V system, this ABB breaker is designed to meet that precise specification.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003ePractical tips for optimal protection\u003c\/strong\u003e — consider pairing this breaker with appropriate enclosure clearance and panel labeling to reflect its 4-pole, 600V protection role. Document the exact part number in your maintenance records to simplify future replacements or retrofits and minimize downtime during service events.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":46427397161122,"sku":"S5N-4P-400A","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_ad06fdd7-931c-4a09-bfbe-d05329579cd6.png?v=1765492978","url":"https:\/\/www.ampstate.com\/products\/abb-s5n-4p-400a-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}